Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 28.18 (715.7) | 1.04 (26.5) 3.8% |
| Width inches (mm) | 5.71 (145) | 9.25 (235) | 3.54 (90) 62.1% |
| Circum. inches (mm) | 85.24 (2165.19) | 88.52 (2248.44) | 3.28 (83.25) 3.8% |
| Sidewall Height inches (mm) | 4.57 (116) | 5.09 (129.25) | 0.52 (13.25) 11.4% |
| Revolutions per mile (km) | 743.28 (461.85) | 715.76 (444.75) | -27.52 (-17.1) -3.7% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.77 mph (33.42 km/h) |
| 25 mph (40.23 km/h) | 25.96 mph (41.78 km/h) |
| 30 mph (48.28 km/h) | 31.15 mph (50.14 km/h) |
| 35 mph (56.33 km/h) | 36.35 mph (58.49 km/h) |
| 40 mph (64.37 km/h) | 41.54 mph (66.85 km/h) |
| 45 mph (72.42 km/h) | 46.73 mph (75.21 km/h) |
| 50 mph (80.47 km/h) | 51.92 mph (83.56 km/h) |
| 55 mph (88.51 km/h) | 57.11 mph (91.92 km/h) |
| 60 mph (96.56 km/h) | 62.31 mph (100.27 km/h) |
| 65 mph (104.61 km/h) | 67.5 mph (108.63 km/h) |
| 70 mph (112.65 km/h) | 72.69 mph (116.99 km/h) |
| 75 mph (120.7 km/h) | 77.88 mph (125.34 km/h) |
| 80 mph (128.75 km/h) | 83.08 mph (133.7 km/h) |
| 85 mph (136.79 km/h) | 88.27 mph (142.05 km/h) |
| 90 mph (144.84 km/h) | 93.46 mph (150.41 km/h) |
| 95 mph (152.89 km/h) | 98.65 mph (158.77 km/h) |
| 100 mph (160.93 km/h) | 103.85 mph (167.12 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1821 | 2116 | 2279 | 2380 | 2488 | 2566 | 2651 | 2752 | 2891 | 3031 | 3186 | 3310 | 3534 | 3782 | 3976 | 4100 | 4170 | 4426 | 4782 | 5557 |
Better Fuel Economy Factory Ratios Increased Power
